JPS63165135A - Composite type vibration-damping metallic plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a composite vibration damping device that has a synthetic resin layer between two metal plates and has excellent damping performance over a wide range of temperature changes. It is related to metal plates.

[Conventional technology and problems]

In recent years, there has been a great social need to prevent noise generated from machinery, etc., and for this reason, for example, parts such as engine oil pans and dash panels in automobiles, where single metal sheets such as cold-rolled steel sheets have traditionally been used, have become increasingly important. Composite vibration-damping metal plates with a synthetic resin layer between two metal plates have come to be used, and their use has expanded not only to automobile parts but also to other machinery and even construction parts such as houses. There is a tendency to

Synthetic resins used in such composite vibration-damping metal plates include coated ones such as rubber adhesives and epoxy resins, or films made of thermoplastic polymers such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymers. Such a composite damping metal plate has the advantage of a simple structure and low manufacturing cost.

[Problem that the invention seeks to solve]

However, in many of these conventional composite vibration-damping metal plates, the damping property (the property of damping vibrations and suppressing noise generation) is highly temperature-dependent (the property that damping property is manifest only in the temperature range). Since vibration damping characteristics can only be obtained in a narrow temperature range, they are classified into room temperature, medium temperature, and high temperature use depending on the temperature of the environment in which they are used, which not only increases production and management costs but also increases usage. There was a problem in that vibration damping characteristics may not be exhibited if conditions change.

[Means for Solving the Problems] The purpose of the present invention is to solve the problems of the prior art described above, and to provide a material that is similar to the conventional composite damping metal plate in that it has a synthetic resin layer between two metal plates. However, the object of the present invention is to provide a versatile composite vibration damping metal plate which has low temperature dependence of damping properties and has sufficient damping properties.

In order to solve the above-mentioned conventional problems and achieve the purpose of the present invention, the present inventors have conducted extensive research and found that if two or more synthetic resin layers having different temperature dependencies are laminated as synthetic resin layers, If it is determined that vibration damping properties can be obtained over a wide temperature range, and if the difference in temperature dependence is produced by changing the composition ratio of polybutadiene diol and the isocyanate compound as a curing agent, excellent control can be achieved. They completed the present invention by discovering that vibration characteristics can be obtained.

That is, the present invention provides a composite vibration-damping metal plate having a synthetic resin layer between two metal plates, in which the synthetic resin layer is made of a two-component mixed composition of polybutadiene diol and an isocyanate compound; This invention relates to a composite damping metal plate characterized by having a laminated structure of multiple layers having different composition ratios.

[Explanation of configuration]

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a cross-sectional explanatory diagram of a composite vibration damping metal plate according to the present invention,
FIG. 2 is a graph showing the temperature dependence of one embodiment of the composite damping metal plate according to the present invention and a conventional example, and FIG. 3 is a graph showing one implementation of the manufacturing process of the composite vibration damping metal plate according to the present invention. FIG. 4, which is a schematic view showing an example, is a graph showing the temperature dependence of the viscoelastic properties of each mixed composition used for the synthetic resin layer of the composite vibration-damping metal plate according to the present invention.

The composite vibration damping metal plate according to the present invention has two parts as shown in FIG.
It consists of two metal scrap plates 1 and a synthetic resin layer 2 between them, and the synthetic resin layer 2 is composed of two or more layers (two layers 2a and 2b in the illustrated example). Each of the layers 2a and 2b constituting the synthetic resin layer 2 is made of a mixed composition of polybutadiene diol and an incyanate compound, and the mixing ratio of the polybutadiene diol and the isocyanate compound in each of these layers 2a and 2b is [ It can be expressed by the equivalent ratio of the former hydroxyl group (OH) to the latter isocyanate group (NGO). ] are different.

The polybutadiene diol used in the present invention preferably has a number average molecular weight of 2,500 to 4,000.

In addition, another incyanate compound that is one component is diphenylmethalin isocyanate.

Tolylene diisocyanate, hexamethylene diisocyanate, polymethylene polyphenylisocyanate, xylylene diisocyanate, etc. can be used, and diphenylmethalin isocyanate is particularly preferred because it has excellent curing properties against polybutadiene diol.

As the metal plates 1 forming both sides of the synthetic resin layer 2, in addition to ordinary steel plates 2, surface-treated steel plates, stainless steel plates, etc., non-ferrous metal plates such as aluminum plates are also used.

To manufacture the composite damping metal plate according to the present invention.

As shown in FIG.
After carrying out a chemical conversion treatment, each metal plate 1 is coated with a mixture ratio of polybutadiene diol and an incyanate compound in a different mixing ratio using a roll coater 4. Next, it can be produced by heating with a hot air drying bag @ 5, heating and pressing with a heated laminator device 6, reheating with a hot air drying device 7, and then cooling with a water cooling device 8. Polybutadiene diol and incyanate compound The synthetic resin layer consisting of the two-component mixed composition can also be produced by forming each into a film and then sandwiching it between two metal plates.

[Effect]

As mentioned above, the composite vibration damping metal plate according to the present invention uses a mixed composition of polybutadiene diol and an isocyanate compound as the synthetic resin layer, and laminates a plurality of layers with different composition ratios of the two components. It has excellent vibration damping properties against changes in vibration, but by changing the blending ratio of polybutadiene diol and incyanate compound, the temperature dependence of the viscoelastic properties of the composition changes. It's for a reason. That is, by changing the blending ratio of polybutadiene diol and isocyanate compound, two or more types are selected from those that have different temperature dependence of their viscoelastic properties, and two or more layers are formed between two metal plates. By having a laminated structure, high vibration damping characteristics can be obtained in a wide temperature range that cannot be obtained with a composite vibration damping metal plate consisting of a single synthetic resin layer.

Note that the difference in the mixing ratio of the two components between each layer is at least NGO
It is preferable that the loH equivalent ratio is 0.1 or more.

〔Example〕

Next, the present invention will be specifically explained with reference to Examples.

The synthetic resin used is a two-component heating type in which the main ingredient is polybutadiene diol (number average molecular weight: 3000) and the curing agent is diphenylmethalin isocyanate. Mixing ratio of both (
A damping steel plate was prepared by the method shown below while changing the equivalent ratio of NGOloH as shown in the table, and the temperature dependence of damping characteristics was investigated. The vibration-damping steel plate was produced by applying a usual chemical conversion treatment, then coating the steel plate with a two-component mixture using a bar coater, and heating it at 130° C. for 1 minute.

After that, one steel plate was placed on the coated surface of the other steel plate and the intermediate synthetic resin layer was heat-pressed to a thickness of 50 μm. The dynamic loss (tan
δ) using a DuPont dynamic thermomechanical analyzer IDM.
Measurements were made using the A982 model using the resonance number change resonance method, and the results are shown in FIG. FIG. 4 shows two types of ranges of equivalent ratios of NGOloH. From this figure 4, NGOlo
It was found that as the H equivalence ratio increases, the maximum dynamic loss shifts to the higher temperature side. Therefore, among these NC○10H equivalent ratios, the equivalent ratio of NGOloH is 0.65 (the temperature showing the maximum dynamic loss is 50°C) and 1.09 (same <9
0℃), and 1 synthetic resin layer is 2jPJ like these.
We investigated the damping properties of a damping steel plate made of . The test piece was prepared using a continuous coating laminating apparatus shown in FIG. In other words, a cold-rolled steel plate 1, 1 with a coil shape of 0.6 ma + thickness
are passed simultaneously, and the lower surface of one cold-rolled steel sheet 1 and the upper surface of the other cold-rolled steel sheet 1 are subjected to chemical conversion treatment in the chemical conversion treatment apparatus 3, and then the equivalent of NGOloR among the two types of two-liquid mixtures described above is The cold rolled steel plates 1, 1 were coated with the same ratio of <1.09 as that of 0.65 using the roll coater 4. The final coating thickness in this case is 25
It was controlled to be 50μ and 50μ. After this,
It was heated at 130° C. using a hot air drying device 5. Then, the heating laminator device 6 heated the temperature to 120 to 140°C.
Heat and pressure bonding was carried out under the condition of 5 kg/a+1. After further heating this to 70 to 80°C in a hot air drying device 7, a water cooling device 8
Cooled by

The loss coefficient (η) of the vibration damping steel plate obtained as described above was measured by the resonance method (calculated from the second resonance peak using an electromagnetic vibration device manufactured by Shinken Co., Ltd.), and the temperature dependence of the vibration damping property was measured using the resonance method. The results are shown in Figure 2. Figure 2 shows a system in which the synthetic resin layer is composed of polybutadiene diol and diphenylmethane diisoleanate, and the mixing ratio (equivalence ratio of NCo10H) is 0.65 and 1.09.
The characteristic values of a conventional vibration damping steel plate, which is a single-layer structure, are also listed. From this result, the temperature range of vibration damping steel plates (a) and (b) consisting of two synthetic resin layers is the same as that of conventional vibration damping steel plates (c) and (d).
It was found that the temperature range was wide, and there was almost no decrease in the loss coefficient (η), indicating high vibration damping properties equivalent to those of conventional single-layer damping steel plates. Also 2
It was confirmed that the adhesive strength of the vibration-damping steel plate made of layers was the same as that of the distributed steel plate made of a single layer, and that it had excellent adhesive strength.

〔effect〕

As detailed above, the composite vibration damping metal plate according to the present invention is
The synthetic resin layer between the two metal plates is made up of two or more layers with different temperature dependence of viscoelastic properties, which provides excellent vibration damping properties over a wide temperature range. It has many uses in addition to parts and construction materials, and is not only highly versatile, but also because two or more layers are made of the same synthetic resin, it is easy to stack, and the manufacturing method and equipment are simple. Its production cost is low and its industrial value is very large.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a composite vibration damping metal plate according to the present invention,
FIG. 2 is a graph showing the temperature dependence of one embodiment of the composite damping metal plate according to the present invention and a conventional example. FIG. 3 shows 1 of the manufacturing process of the composite vibration damping metal plate according to the present invention.
FIG. 4 is a graph showing the temperature dependence of the viscoelastic properties of each mixed composition used in the synthetic resin layer of the composite damping metal plate according to the present invention. 1...Metal plate 2...Synthetic resin layers 2a, 2b...Calendar 3 constituting the synthetic resin layer...
・Chemical conversion treatment device 4...Roll coater 5...Hot air drying device 6...Heating laminator device 7...Hot air drying device 8...Water cooling device

Claims (1)

[Scope of Claims] 1. A composite vibration damping metal plate having a synthetic resin layer between two metal plates, wherein the synthetic resin layer is made of a two-component mixed composition of polybutadiene diol and an isocyanate compound; A composite vibration-damping metal plate characterized by having a laminated structure of multiple layers with different composition ratios. 2. The composite vibration damping metal plate according to claim 1, wherein the isocyanate compound is diphenylmethalin isocyanate. 3. Claim 1, wherein the composition ratio of polybutadiene diol and isocyanate compound in each layer of the synthetic resin forming a laminated structure has a difference of 0.1 or more in the equivalent ratio of hydroxyl group to isocyanate group, or The composite vibration damping metal plate according to item 2.